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I'm not able to build NASM sources with flags like -DDIR="C:\\Program Files\\Common Files" when using CMake v3.15.3. My NASM version is 2.14.02.

I'm building on Windows with Visual Studio:

cmake -G "Visual Studio 15 2017" -A Win32 <CMakeLists.txt dir>
cmake --build . --config Release

Here's relevant build message with the error:

_NASM:
  Assembling 2.asm
  cmd.exe /D /C "<...>\AppData\Local\Temp\tmpd35a6162c1a149709a9536c9f5da074d.cmd"
  "<...>/AppData/Local/bin/NASM/nasm.exe" -o "app.dir\Release\2.obj" -fwin32 -D"WIN32" -D"_WINDOWS" -D"NDE
  BUG" -D"DIR="C:\\Program Files\\Common Files"" -D"CMAKE_INTDIR="Release""  "<...>\2.asm"
  Files\\Common: fatal: more than one input file specified: Files

Important to note that CMake v3.12.4 builds the same CMakeLists.txt without any problems.

CMakeLists.txt:

cmake_minimum_required(VERSION 3.8)
project(test C ASM_NASM)
add_executable(app 1.c 2.asm)
target_compile_options(app PRIVATE "-DDIR=\"C:\\\\Program Files\\\\Common Files\"")

1.c:

#include <stdio.h>

int main() { printf(DIR); }

2.asm: empty